John Gills Exposition of the Bible Commentary - Psalms 18:26
With the pure thou wilt show thyself pure ,.... None of Adam's posterity are pure by nature; they are all defiled with sin; and though some are pure in their own eyes, they are far from being cleansed from their filthiness; such only are pure who are sanctified by the Spirit of God, have clean hearts created in them, and whose hearts are purified by faith in the blood of Christ; who are justified by Christ's righteousness, and are washed from their sins in his blood; and who, in consequence... read more
Matthew Henry's Complete Commentary - Psalms 18:20-28
Here, I. David reflects with comfort upon his own integrity, and rejoices in the testimony of his conscience that he had had his conversation in godly sincerity and not with fleshly wisdom, 2 Cor. 1:12. His deliverances were an evidence of this, and this was the great comfort of his deliverances. His enemies had misrepresented him, and perhaps, when his troubles continued long, he began to suspect himself; but, when God visibly took his part, he had both the credit and the comfort of his... read more